Ed Storms says he uses Matheson Tri-gas supplies. They sell hydrogen at different purity levels. See:
http://www.mathesongas.com/pdfs/products/Hydrogen-Pure-Gas.pdf He does not recall the price. He thinks an 80 cu-ft cylinder of high purity H2 costs about $100, and D2 costs about $1,500. I can't find a price list on line. Here is hydrogen generator: http://www.mathesongas.com/pdfs/products/chrysalis-standard-economy-hydrogen-generator.pdf It is an expensive and elaborate machine. It produces H2 at 1 atm from water. You would need a high pressure pump add on. Here is a bunch of equipment used to deal with gas: https://www.gsaadvantage.gov/ref_text/GS07F0460U/0G8PER.1V6R3Q_GS-07F-0460U_GSACATALOG.PDF Mizuno had several of these filters and things connected together with pipes, mounted on the plywood. Imagine taking the guts out of the hydrogen generator and mounting the components in series, serpentine. - Jed
